How to pass parameters to servlet with POST with Business Service OSB

Hi all.
I am newby in OSB. I am trying to send some values through a POST call to a servlet. I know how to call the servlet with Business Service of type "Messaging Service". I send the parameters of type Text.
I have tried several ways, but I don`t find the proper way yo do it. I have tried to insert the param into the body and into the header.
The problem is that I don`t know exactly where to put them, I don`t know if it must be done in the header or in the boy. I neither don`t know if there is a common way to do this.
Please, could you give me a good example of an insert activity to isert a post parameter inside the call?
For example: now I am using this one:
Expression => "accountType=test"
Location => as first child of"
XPATH => empty.
In variable => body.
Where do I have to insert this, in the body or in the outbounds?
I have followed this posts:
https://blogs.oracle.com/jeffdavies/entry/enhanced_rest_support_in_oracl
http://www.yenlo.nl/en/using-osb-with-rest/
Thanks a lot.

Hi,
Please be carefull about passing values such as Strings or number that contains ',' .
using the way described above.
the best way is to pass an ID and then use a select Statement to get the other Values in the target page.
regards
MDK.

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